Hot Standby of LANs at a Remote Location For Disaster Recovery

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Aug 19th, 2003
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My company is trying to complete a disaster recovery project. I am trying to understand what is possible for us to connect our production facility to a remote facility (over DS/3). Unfortunately, we were told we can't spend much money, so I have to work with what I have to reduce how much we spend. Now on to the good stuff...


We have a 3548 with 6 vlans defined for our DMZ subnets. We need to be able to have the same 6 subnets at the remote location. Also, we need these to be hot. I have tried connecting one switch port with ISL trunking to the router and then creating a bridge group for each vlan in the router. This worked when the two interfaces in the router were fas ethernet. But, when I tried using a serial interface, this no longer worked. I know someone has had to do this before. What are your experiences? Any ideas?

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vmiller Tue, 08/19/2003 - 07:45
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Did you put the serial interface in the bridge-group?

rjackson Tue, 08/19/2003 - 08:13
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The way you are decribing it it sounds like you need 6 bridge groups on the serial. I dont know if thats possible. I never considered doing such a thing, I usually avoid any bridging on routers.

w.brunson Tue, 08/19/2003 - 08:22
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Well, if there is an easier way I would like to avoid bridging also.


My router has six sub-interfaces on the fast ethernet and serial interface. Then I added each interface (ex fas 0/0.1 and ser 0/0.1 = bridge-group 1) to a bridge group. Then I also created a bvi interface for each bridge group.


I have seen some post talking about l2tp, but I haven't seen any configuration examples of such.

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